Boron: Discovered in 1808 by Sir Humphrey Davy, Joseph Louis Gay-Lussac and Louis Jacques Thenard
v Symbol: B v Atomic number: 5 v Atomic mass: 10.811 v Protons :5 v Electrons:5 v Neutrons:6
v Found: usually found in boron mines in different countries ( Turkey, USA, Argentina, Chile, Russia, China, and Peru
Form: solid (nonmagnetic)
Melting point: 2300.0 degrees C (4172.0 degrees F)
Boiling point: 2550.0 degrees C ( 4622.0 degrees F)
Density:2.34 g/cm3 Abundance in the earth’s crust: 10 ppm ( parts per million)
Uses: used in agriculture as it plays a notable role in plant fertilisation and in building of cell wall structures, It gives distinctive green flame, hence used in pyrotechnic flares, advanced aerospace structures as a component of composite materials, reducing aldehydes and ketones to alcohols, and in P-type semiconductors as dopant.
Discovered in 1808 by Sir Humphrey Davy, Joseph Louis Gay-Lussac and Louis Jacques Thenard
v Symbol: B
v Atomic number: 5
v Atomic mass: 10.811
v Protons :5
v Electrons:5
v Neutrons:6
v Found: usually found in boron mines in different countries ( Turkey, USA, Argentina, Chile, Russia, China, and Peru
Form: solid (nonmagnetic)
Melting point: 2300.0 degrees C (4172.0 degrees F)
Boiling point: 2550.0 degrees C ( 4622.0 degrees F)
Density:2.34 g/cm3
Abundance in the earth’s crust: 10 ppm ( parts per million)
Uses: used in agriculture as it plays a notable role in plant fertilisation and in building of cell wall structures, It gives distinctive green flame, hence used in pyrotechnic flares, advanced aerospace structures as a component of composite materials, reducing aldehydes and ketones to alcohols, and in P-type semiconductors as dopant.
Crystal structure: Rhombohedra
Oxidation state: +3
Atomic radius: 85 pm
Covalent radius: 82 pm
Heat of fusion: 50.2 kJ mol-1
Heat of vaporization: 480 kJ mol-1
Sources: http://www.chemicool.com/elements/boron.html